Helmet retention



FIG. 1 is a perspective view of the present design;

FIG. 2 is a front view of the present design;

FIG. 3 is a rear view of the present design;

FIG. 4 is a left side view of the present design;

FIG. 5 is a right side view of the present design;

FIG. 6 is a top view of the present design;

FIG. 7 is a bottom view of the present design; and,

FIG. 8 is another perspective view of the present design.

The broken lines showing structural features are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a helmet retention, as shown and described. 